Question

how to sum 20.you took 3 five time​

Answer 1

Answer:

This is a question on permutation.

With permutation the order of the arrangements is necessary.

The formula for permutation is as follows :

Given n objects from which you need to choose r objects at a time the formula for the permutation is as follows :

p = \frac{n!}{(n - r)!}

(n−r)!

n!

From the question above we have :

n = 20

r = 3

We need to get the numbers that when picked three at a time can sum up to 20.

We do the substitution as follows :

P = 20!/(20-3)!

This equals to :

20!/17! = 6840

The answer is 6840 ways.

Step-by-step explanation:

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